"That's amazing. Can you make a big life potion?" Niu Bi asked.

"Tsk, what's a big life potion? I can make a special life potion that can instantly restore 5,000 lives." Cai Yi raised her head, with an arrogant attitude that the big life potion was nothing.

Niu Bi rubbed his hands and laughed: "Cai Yi, what are we waiting for? What herbs do you want? I'll go dig them now!"

"Master, don't worry!" Cai Yi flew to the top of Niu Bi's head and sat down: "Special life potions require several special herbs that can only grow in certain specific environments, and where these herbs grow, there must be high-level monsters guarding them, so the master should improve his strength first! As long as his strength is improved, he can go to collect herbs."

"Uh..." Niu Bi scratched his head: "It's too difficult to level up. It will take a long time to go to collect herbs!"

"Master, don't be discouraged!" Cai Yi encouraged : "Master, it only took a few days to reach level 19, which is very fast. I believe that it won't be long before you can pick those high-level herbs. For now, you can pick some low-level herbs. Although you can't make special life potions, you can still make some low-level pills and potions."

"Okay!" Niu Bi put Xiao Huang into the pet space and asked, "Where are the herbs nearby?"

"Master, go around! There are herbs almost everywhere in the dream space. People will tell you the useful herbs."

"Okay, I'll listen to you." Niu Bi chose a direction and walked all the way.

Just as Cai Yi said, there are herbs everywhere in the dream space, and even the large patches of green grass on the roadside may be herbs, but they don't meet the standards for refining medicine, and Cai Yi denied them one by one.

After walking for several kilometers, Niu Bi dug out some useful herbs from time to time under Cai Yi's command and threw them to Cai Yi. It was at this time that Niu Bi realized that Cai Yi also had a storage space. These herbs were stored by Cai Yi. If Niu Bi left the dream space, Cai Yi could help Niu Bi refine herbs during this period.

As Cai Yi showed more and more abilities, Niu Bi really felt that he could not leave Cai Yi anymore. It was a pity that Cai Yi could not leave the dream space, otherwise Niu Bi really wanted to take her to the reality to have a look.

In addition to collecting herbs, he also encountered some monsters along the way, but the level was not high and the number was not large. All of them became Niu Bi's experience. At the same time, they would also offer some money and occasionally some potions.

Now Niu Bi's inventory contains not only life potions and magic potions, but also stamina potions and detoxification potions, which are all very practical. However, so far, Niu Bi has used magic potions the most. Because of the frequent use of various magic skills such as summoning skeletons, Niu Bi's magic is consumed very quickly. Although he can slowly restore life and magic, when encountering a battle, the recovery power can't keep up with the consumption. Although Niu Bi has exploded a lot of magic potions, now there are only a dozen bottles left, which is pitiful compared to hundreds of bottles of life potions, and forty or fifty bottles of stamina and detoxification potions.

Niu Bi now has a huge resentment towards magic potions. Fortunately, Caiyi knows the master's troubles and said that the first time he refines medicine, he will refine a large amount of magic potions for Niu Bi so that Niu Bi will not worry about consuming magic.

Unconsciously, Niu Bi walked to a river. After picking some herbs that Cai Yi needed, Niu Bi saw hundreds of big turtles crawling out of the river. These turtles were very big, the smallest was 50 centimeters, and the largest was even more than one meter. Niu Bi's eyes lit up immediately: "Cai Yi, what level are these turtles?"

"This is a level 15 big turtle, attack 100, defense 500, life 3000." Cai Yi took a look and casually said the attributes of the big turtle.

"Uh, it's so rubbish!" Although the defense is very high and the life is very long, the attack power of 100 is really too rubbish, even worse than the level 10 monster, it is simply a material for being beaten.

"It's okay! Big turtles are not creatures that are good at attacking. They are peaceful and never attack actively. By the way, the master used to catch turtles to catch fish for food. Now the master can fight them. It seems that in the world where the master is, wild turtles are very valuable." Cai Yi said.

"Yeah! Hehe, wild turtles are very expensive, but the restaurant only accepts live turtles. If I kill them all, I guess I can't sell them." Niu Bi didn't think of it at the beginning, but he has thought of the problem of turtles these days.

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"Is that so..." Caiyi thought for a while: "Then the master can tame these big turtles for the time being, and kill them when needed!"

"Can my summoned beasts be killed by me?" Niu Bi frowned.

"Stupid master, you can let others kill them!"

"Uh..., no! Although this big turtle is rubbish to me, in our world, they are ferocious beasts. Their attack power is the same as when I was level 8. I guess they can fight with crocodiles. It's too dangerous." Don't look at Niu Bi's carelessness. He is not confused about these details. Human life is at stake, so Niu Bi can't help but be cautious.

"Is that so..." Caiyi seems to have no other choice: "It seems that these big turtles can only be used for viewing."

"Viewing..." Niu Bi touched his chin and seemed to have some ideas.

"Let's tame them first, maybe they'll be useful in the future." Niu Bi summoned Xiao Huang and fifty silver skeleton monsters without saying a word, and beat the big turtle's health to less than 30% with a violent attack. Then he used the taming method. Because the level of these big turtles was lower than Niu Bi, the basic success rate was 80%, but with Niu Bi's 32 luck bonus, the success rate became 100%. More than a hundred big turtles were all tamed by Niu Bi at once.

Looking at more than a hundred big turtles lying quietly in the pet space to rest, Niu Bi laughed: "These turtles look quite fun. It would be nice to keep them in the pond."

"What's so fun about turtles? The owner might as well keep a cat demon! Not only is it cute, but it can also fly. How great!" Cai Yi said.

"Cat demon?" Niu Bi thought for a while: "Oh, it's the cat demon whose stomach was cut open last time and its intestines were all over the floor!"

"Hate, what is the master talking about!" Cai Yi felt nauseous when she thought of the original scene.

"Hehe, no more talking." Niu Bi looked at the clear river water: "The river water is so clear, I wonder if it can be drunk?"

"Of course it can be drunk! The dream space is not polluted and has sufficient spiritual energy, so even ordinary river water contains spiritual energy. Although it cannot cure all diseases after drinking it, it can improve physical fitness, make people healthy and not prone to illness."

"So good?" Niu Bi was surprised, and then his face was full of joy: "Cai Yi, can I take this water out?"

"As long as there is a container, as much as possible will do, but there are very few container-type equipment in the dream space. Even if you kill 100 million monsters, it may not explode."

"This..." Niu Bi flipped through his inventory, and sure enough, there was no container that could hold water.

Frowning, Niu Bi asked: "Cai Yi, can we make a container ourselves?"

"Well..." Cai Yi looked embarrassed: "Cai Yi doesn't know how to do it!"

"Don't know?" Niu Bi found it interesting, and finally knew that Cai Yi also didn't know how to do it.

"Hate it, no one is perfect, what's wrong with me?" Caiyi snorted, flew to the top of Niu Bi's head, and pulled his hair hard.

"Gently, gently..." Niu Bi didn't know whether to laugh or cry. After being on guard for so long, Caiyi finally caught the opportunity to pull his hair. Niu Bi was a little worried about his hair. He was so young, what would he do if he was pulled bald?

Niu Bi had a picture in his mind. A few years later, when he and Wu Yuyan walked into the marriage hall hand in hand, the bride Wu Yuyan was wearing a white wedding dress, so beautiful that she looked like a fairy, but there was a bald man standing beside her...

Niu Bi shook his head vigorously, with a bitter face: "Cai Yi, please don't pull my hair in the future, okay?"

Cai Yi was silent for a moment, and let go of her hand: "Okay! Isn't it okay if I don't pull it in the future!"

"Really? Thank you so much." Niu Bi grinned and looked at the river water in front of him. Such good water, but it can't be taken out, it's really a waste, a waste of natural resources!

Niu Bi frowned, put his hands on his waist, and wanted to come up with a solution.

"Huh?" Niu Bi pinched his waist, looked down at the snakeskin armor on his body, and his eyes lit up: "Cai Yi, aren't you an excellent tailor! Can you sew a few water bags with giant python skin?"

"Water bags..." Cai Yi tilted her head and thought about it, and felt that there was no problem: "It should be possible!"

"That's great." Niu Bi immediately took out a white giant python skin from the inventory, smelled some fishy smell, and washed it by the river. When he felt it was completely clean, he put it on the shore and laughed: "Cai Yi, thank you for your trouble."

"It's a piece of cake, watch me." Cai Yi flew down from Niu Bi's head, and her hands radiated colorful light like needles and threads. After just one minute, the white giant python skin turned into a large water bag with only one opening, and there was also a rope buckle at the opening. After filling it with water, just pull it to seal the opening, and no water will flow out.

"Not bad! Really good." Niu Bi gave Cai Yi a thumbs up: "Cai Yi, you are really good."

"Hehe, of course." Cai Yi laughed and landed on Niu Bi's head: "Master, in fact, if you want water, it's better to find some mountain springs. Mountain spring water is much better than river water, and the spiritual energy is more abundant."

"Where are the mountain springs?" Niu Bi asked.

"Mountain springs are generally in the territory of high-level monsters, and there are at least 50-level monsters active, so the master still needs to work hard to upgrade." Cai Yi said.

"I don't know when that will happen, I'd better use river water first!" Niu Bi pressed the opening of the water bag into the water, and the water bag expanded rapidly at a speed visible to the naked eye. A few minutes later, a huge white water ball was pushed to the shore by Niu Bi with great effort.

The diameter of this water ball is at least three meters, and the water it contains weighs more than three tons. Even though Niu Bi's current strength is over 200, it is still very strenuous, mainly because there is no part to exert force on, and there is only a small bulge at the water opening. He cannot hold it with one hand, let alone with both hands. In addition, the water ball is too big and soft, so Niu Bi cannot lift it at all. In the end, he can only push it.